12162281 has 16 divisors (see below), whose sum is σ = 13199760. Its totient is φ = 11182080.

The previous prime is 12162263. The next prime is 12162317. The reversal of 12162281 is 18226121.

It can be written as a sum of positive squares in 8 ways, for example, as 1000000 + 11162281 = 1000^2 + 3341^2 .

It is a cyclic number.

It is not a de Polignac number, because 12162281 - 2¹⁴ = 12145897 is a prime.

It is a super-2 number, since 2×12162281² = 295842158245922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12162211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62921 + ... + 63113.

It is an arithmetic number, because the mean of its divisors is an integer number (824985).

Almost surely, 2^12162281 is an apocalyptic number.

It is an amenable number.

12162281 is a deficient number, since it is larger than the sum of its proper divisors (1037479).

12162281 is a wasteful number, since it uses less digits than its factorization.

12162281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316.

The product of its digits is 384, while the sum is 23.

The square root of 12162281 is about 3487.4462003019. The cubic root of 12162281 is about 229.9702608051.

The spelling of 12162281 in words is "twelve million, one hundred sixty-two thousand, two hundred eighty-one".